Listening to the Quantum Mechanical Formalism
{"Image DocumentName": "Listening to the Quantum Mechanical Formalism", "Image ImageDescription": "Consider a quantum matrix element: <S> = \u00f2v y  S y dr3 = <f | S | i> \u2026 a y  - y sandwich . What does this suggest? Hint: The complex conjugation in y  is the Wigner operator for time reversal. If y is a retarded wave, then y  is an advanced wave. If y = A ei(kr - wt) then y  = A ei(-kr + wt) (retarded) (advanced) A retarded wave carries positive energy to the future. An advanced wave carries negative energy to the past.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}